IN a stunning development, sources tell The ENQUIRER that KRIS JENNER could be hiding a secret sex tape. And if it exists, it could destroy BOTH her marriage and career!

Insiders believe the mastermind of the Kardashian empire may have been caught on video during the 1980s, when she and her late husband Robert lived a wild lifestyle. And the incredible sex tape could now, after all these years, hit the market because of her huge success and threaten her estimated $75 million fortune.

According to one source, Robert told his good friend O.J. Simpson that he overheard Kris telling her girlfriend all about the scandalous tape.

“Robert said Kris was talking about how liberating it was to be filmed having sex and how it was a turn-on to watch herself with her lover,” revealed a close source. “She said she felt like a porn star.

“When Robert heard that, he confronted Kris. But she laughed it off, telling him she was just kidding around. She said she knew he was there and wanted to teach him a lesson about eavesdropping on her conversations with her girlfriends.

“Robert wasn’t sure what to believe, so he told O.J. about it to see what he thought.”

As The ENQUIRER previously reported, O.J. told pals that he slept with Kris in the mid-1980s during her marriage to Robert and has even joked that Khloe Kardashian is his biological daughter. He also reportedly enjoyed a three-way sex romp with Kris and his then-wife Nicole Brown Simpson.

“Back in the day when she was cheating on Robert, Kris was capable of anything,” said a pal.

And in her sizzling memoir “Kris Jenner…and All Things Kardashian,” the 57-year-old beauty admitted she carried on a torrid affair with a soccer player 10 years her junior, writing that they had “wild, crazy sex all the time, sex on the tennis court, sex in the pool house, sex in the garage, sex up and down the stairs, every-where, all the time.”

But now that Kris and her family are at the height of their success, filmed evidence of the Kardashian “momager’s” sex-drenched past could be devastating – even if it was grainy, amateur footage from 30 years ago.

“If a Kris Jenner sex tape is released, it could destroy the Kardashian brand and be the final straw for her marriage to Bruce, which is already hanging by a thread,” said the close source.

Ugh, this chick is looking more, and more sad. The Kardashian PR machine is churning stories out big time.

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